[Code of Federal Regulations]

[Title 14, Volume 3]

[Revised as of January 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 14CFR150.7]



[Page 75-76]

 

                     TITLE 14--AERONAUTICS AND SPACE

 

CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 

                               (CONTINUED)

 

PART 150_AIRPORT NOISE COMPATIBILITY PLANNING--Table of Contents

 

                      Subpart A_General Provisions

 

Sec. 150.7  Definitions.



    As used in this part, unless the context requires otherwise, the 

following terms have the following meanings.

    Airport means any public use airport, including heliports, as 

defined by the ASNA Act, including: (a) Any airport which is used or to 

be used for public purposes, under the control of a public agency, the 

landing area of which is publicly owned; (b) any privately owned 

reliever airport; and (c) any privately owned airport which is 

determined by the Secretary to enplane annually 2,500 or more passengers 

and receive scheduled passenger service of aircraft, which is used or to 

be used for public purposes.

    Airport noise compatibility program and program mean that program, 

and all revisions thereto, reflected in documents (and revised 

documents) developed in accordance with appendix B of this part, 

including the measures proposed or taken by the airport operator to 

reduce existing noncompatible land uses and to prevent the introduction 

of additional noncompatible land uses within the area.

    Airport Operator means, the operator of an airport as defined in the 

ASNA Act.

    ASNA Act means 49 U.S.C. 47501 et seq.

    Average sound level means the level, in decibels, of the mean-

square, A-weighted sound pressure during a specified period, with 

reference to the square of the standard reference sound pressure of 20 

micropascals.

    Compatible land use means the use of land that is identified under 

this part as normally compatible with the outdoor noise environment (or 

an adequately attenuated noise level reduction for any indoor activities 

involved) at the location because the yearly day-night average sound 

level is at or below that identified for that or similar use under 

appendix A (Table 1) of this part.

    Day-night average sound level (DNL) means the 24-hour average sound 

level, in decibels, for the period from midnight to midnight, obtained 

after the addition of ten decibels to sound levels for the periods 

between midnight and 7 a.m., and between 10 p.m., and midnight, local 

time. The symbol for DNL is Ldn.

    Noise exposure map means a scaled, geographic depiction of an 

airport, its noise contours, and surrounding area developed in 

accordance with section A150.1 of Appendix A of this part, including the 

accompanying documentation setting forth the required descriptions of 

forecast aircraft operations at that airport during the fifth calendar 

year (or later) beginning after submission of the map, together with the 

ways, if any, those operations will affect the map (including noise 

contours and the forecast land uses).

    Noise level reduction (NLR) means the amount of noise level 

reduction in decibels achieved through incorporation of noise 

attenuation (between outdoor and indoor levels) in the design and 

construction of a structure.

    Noncompatible land use means the use of land that is identified 

under this part as normally not compatible with the outdoor noise 

environment (or an adequately attenuated noise reduction level for the 

indoor activities involved at the location) because the yearly day-night 

average sound level is above that identified for that or similar use 

under appendix A (Table 1) of this part.

    Regional Airports Division Manager means the Airports Division 

Manager having responsibility for the geographic area in which the 

airport in question is located.

    Restriction affecting flight procedures means any requirement, 

limitation, or other action affecting the operation of aircraft, in the 

air or on the ground.

    Sound exposure level means the level, in decibels, of the time 

integral of squared A-weighted sound pressure during a specified period 

or event, with reference to the square of the standard reference sound 

pressure of 20



[[Page 76]]



micropascals and a duration of one second.

    Yearly day-night average sound level (YDNL) means the 365-day 

average, in decibels, day-night average sound level. The symbol for YDNL 

is also Ldn.



[Doc. No. 18691, 49 FR 49269, Dec. 18, 1984, as amended by Amdt. 150-1, 

53 FR 8724, Mar. 16, 1988; 53 FR 9726, Mar. 24, 1988; Amdt. 150-2, 54 FR 

39295, Sept. 25, 1989; Amdt. 150-4, 69 FR 57625, Sept. 24, 2004]